<template>
    <div>
        <!-- 面包屑导航 -->
     <el-breadcrumb separator="/">
       <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
       <el-breadcrumb-item><a href="/">商品管理</a></el-breadcrumb-item>
       <el-breadcrumb-item>分类参数</el-breadcrumb-item>
     </el-breadcrumb>
     <!-- 卡片视图区域 -->
     <el-card>
         <!-- 警告区域 -->
         <el-alert title="注意：只允许为第三级分类设置相关参数" type="warning" :closable="false" show-icon></el-alert>
         <!-- 选择商品分类区域 -->
         <el-row class='cat_opt'>
          <el-col>
            <span>选择商品分类：</span>
            <!-- 选择商品分类的级联选择框 -->
             <el-cascader expand-trigger="hover" v-model="selectedCateKeys" 
             :options="catelist" :props="cateProps" @change="handleChange" clearable></el-cascader>
          </el-col>
         </el-row>
         <!-- tab页区域 -->
         <el-tabs v-model="activeName" @tab-click="handleClick">
            <!-- 添加动态参数的面板 -->
           <el-tab-pane label="动态参数" name="many">
               <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
               <!-- 动态参数表格 -->
               <el-table :data="manyTableData" border stripe>
                 <!-- 展开行 -->
                 <el-table-column type="expand">
                   <template slot-scope="scope">
                     <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                     <!-- 输入的文本框 -->
                     <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" 
                     size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                     </el-input>
                     <!-- 添加按钮 -->
                     <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                   </template>
                 </el-table-column>
                <!-- 索引列 -->
                <el-table-column type="index"></el-table-column>
                <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                <el-table-column label="操作">
                 <template slot-scope="scope">
                  <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                 </template>
                </el-table-column>
               </el-table>
           </el-tab-pane>
           <!-- 添加静态属性的面板 -->
           <el-tab-pane label="静态属性" name="only">
               <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
               <!-- 静态属性表格 -->
               <el-table :data="onlyTableData" border stripe>
                 <!-- 展开行 -->
                 <el-table-column type="expand">
                   <template slot-scope="scope">
                     <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                     <!-- 输入的文本框 -->
                     <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" 
                     size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                     </el-input>
                     <!-- 添加按钮 -->
                     <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                   </template>
                 </el-table-column>
                <!-- 索引列 -->
                <el-table-column type="index"></el-table-column>
                <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                <el-table-column label="操作">
                 <template slot-scope="scope">
                  <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                 </template>
                </el-table-column>
               </el-table>
           </el-tab-pane>
         </el-tabs>
     </el-card>
     <!-- 添加参数的对话框 -->
     <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
        <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
     </el-dialog>
     <!--修改参数的对话框 -->
     <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
        <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
     </el-dialog>
    </div>
</template>
<script>
export default {
    data(){
        return {
           //商品分类列表
           catelist: [],
           //级联选择器的配置对象
           cateProps: {
               value: 'cat_id',
               label: 'cat_name',
               children: 'children'
           },
           //级联框双向绑定的数组
           selectedCateKeys: [],
           //被激活的页签的名称
           activeName: 'many',
           //动态参数的数据
           manyTableData: [],
           //静态属性的数据
           onlyTableData: [],
           //控制添加属性对话框的显示与隐藏
           addDialogVisible: false,
           //添加参数表单数据对象
           addForm: {
             attr_name: ''
           },
           //添加参数表单验证规则对象
           addFormRules: {
             attr_name: [
               {required: true,message: '请输入参数名称',trigger: 'blur'}
             ]
           },
           //控制修改参数对话框的显示与隐藏
           editDialogVisible: false,
           //编辑参数对话框的数据对象
           editForm: {},
           //编辑参数对话框的数据规则验证对象
           editFormRules: {
              attr_name: [
               {required: true,message: '请输入参数名称',trigger: 'blur'}
             ]
           },
        }
    },
    created(){
      //获取所有的商品分类列表
      this.getCateList()
    },
    methods: {
    async getCateList(){
        const {data: res} = await this.$http.get('categories')
        if(res.meta.status !== 200){
            return this.$message.error("获取商品分类失败")
        }
        this.catelist = res.data
      },
    //获取参数的列表数据
    async getParamsData(){
          //判断选中的是不是三级分类
        if(this.selectedCateKeys.length !== 3){
          this.selectedCateKeys = []
          return 
        }
        //根据所选分类的id，和当前所处的面板，获取对应的参数
       const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel: this.activeName}})
       if(res.meta.status !== 200){
         return this.$message.error('获取参数列表失败')
       }
       res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        //控制文本框的显示与隐藏
        item.inputVisible = false
        //文本框中输入的值
        item.inputValue = ''
       })
       if(this.activeName === 'many'){
         this.manyTableData = res.data
       }else{
         this.onlyTableData = res.data
       }
    },
       //级联选择器选中项变化事件
    handleChange(){
        this.getParamsData()
      },
      //tab点击事件的处理函数
      handleClick(){
        this.getParamsData()
      },
       //监听添加参数对话框的关闭事件
    addDialogClosed(){
      this.$refs.addFormRef.resetFields()
      },
      //点击按钮添加参数或属性
      addParams(){
        this.$refs.addFormRef.validate(async valid => {
          if(!valid)return
         const {data: res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          })
          if(res.meta.status !== 201){
            return this.$message.error('添加参数失败！')
          }
          this.$message.success('添加参数成功')
          this.addDialogVisible = false
          this.getParamsData()
        })
      },
      editDialogClosed(){
        this.$refs.editFormRef.resetFields()
      },
      async showEditDialog(attr_id){
        //查询当前参数的信息
        const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{params: 
        {
          attr_sel: this.activeName }
        })
        if(res.meta.status !== 200){
          return this.$message.error('获取参数信息失败！')
        }
        this.editForm = res.data
        this.editDialogVisible = true
      },
      //点击按钮提交编辑参数的数据
      editParams(){
       this.$refs.editFormRef.validate(async valid => {
         if(!valid)return
         const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
         {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
         })
         if(res.meta.status !== 200){
           return this.$message.error('修改参数失败')
         }
         this.$message.success('修改参数成功')
         this.getParamsData()
         this.editDialogVisible = false
       })
      },
      //根据id删除对应的参数项
      async removeParams(attr_id){
         const confirmResult = await this.$confirm('此操作将永久删除该项, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)
        if(confirmResult !== 'confirm'){
          return this.$message.info('已取消删除')
        }
        const {data: res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
        if(res.meta.status !== 200){
          return this.$message.error('删除参数失败')
        }
        this.$message.success('删除参数成功')
        this.getParamsData()
      },
      //文本框失去焦点或按下了Enter都会触发
      async handleInputConfirm(row){
        if(row.inputValue.trim().length === 0){
          roe.inputValue = ''
          row.inputVisible = false
          return 
        }
        //如果没有return,则证明输入的内容需要做后续处理
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue = ''
        row.inputVisible = false

        this.saveAttrVals(row)
      },
      async saveAttrVals(row){
         //需要发起请求保存这次操作
        const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        })
        if(res.meta.status !== 200){
          return this.$message.error('修改参数项失败！')
        }
        this.$message.success('修改参数项成功！')
      },
      //点击按钮展示文本输入框
      showInput(row){
        row.inputVisible = true
        //让文本框自动获得焦点
        //$nextTick的作用：当页面上元素被重新渲染之后，才会调用回调函数里指定的代码
        this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus()
        })
      },
      //删除对应的参数可选项
      handleClose(i,row){
        row.attr_vals.splice(i,1)
        this.saveAttrVals(row)
      }
    },
    computed: {
        //如果按钮需要被禁用则返回true,否则返回false
        isBtnDisabled() {
          if(this.selectedCateKeys.length !== 3){
            return true
          }
          return false
        },
        //当前选中的三级分类的id
        cateId(){
          if(this.selectedCateKeys.length === 3){
            return this.selectedCateKeys[2]
          }
          return null
        },
        //动态参数和静态属性共用一个添加对话框，所以需要动态绑定对话框的标题
        titleText(){
          if(this.activeName === 'many'){
            return '动态参数'
          }
          return '静态属性'
        }
    }
}
</script>
<style lang="less" scoped>
.cat_opt {
    margin: 15px 0;
}
.el-tag {
  margin: 10px
}
.input-new-tag {
  width: 150px;
}
</style>